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Separate ligatures in search string matching

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MM20 2022-10-15 15:58:22 +02:00
parent 0731282ea1
commit 1d50a3e24e
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1 changed files with 9 additions and 3 deletions
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ktx/src/main/java/de/mm20/launcher2/ktx/String.kt
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@ -10,16 +10,22 @@ fun String.decodeUrl(charset: String): String? {
} }
/** /**
* Normalize a string to lowercase ASCII * Normalize a string to lowercase string
* TODO: Only supports Chinese/Pinyin at the moment * This is used for substring matching.
* Characters must be normalized independently so that
* A.contains(B) -> A.normalize().contains(B.normalize()) is true.
*/ */
fun String.normalize(): String { fun String.normalize(): String {
return StringUtils.stripAccents(this.romanize().lowercase(Locale.getDefault())) return StringUtils.stripAccents(this.romanize().lowercase(Locale.getDefault()))
.replace("æ", "ae")
.replace("œ", "oe")
.replace("ß", "ss")
} }
/** /**
* Romanize a string, transliterate non-latin characters into latin * Romanize a string, transliterate non-latin characters into latin
* TODO: Only supports Chinese/Pinyin at the moment * This is used for sorting. The resulting string represents the position where the original
* string should be sorted in the latin alphabet.
*/ */
fun String.romanize(): String { fun String.romanize(): String {
return Pinyin.toPinyin(this, "") return Pinyin.toPinyin(this, "")